Baader Cool Ceramic (Safety)- Herschel Œ Solar Prism€¦ · The Baader Safety Herschel-Prism features a ceramic window which works as Solar finder screen and ﬁheat cageﬁ at

Instruction ManualBaader Cool Ceramic Safety Herschel-Prism

- 1 - Copyright Baader Planetarium GmbH, all rights reserved

Instruction Manual

and Tips + Tricks

for the

Baader Cool Ceramic (Safety)-

Herschel � Solar Prism

© 2010 Baader Planetarium GmbH


Copyright Baader Planetarium GmbH, all rights reserved - 2 -

The new BAADER 2" COOL-CERAMIC SAFETY Herschel-Prism for white light Solar observation, including ceramicSolar finder screen and 2" ClickLock® eyepiece clamp.

There is no better � and most of all no safer way for unpar-alleled visual and photographic contrast for white light Solarobservation.

TABLE OF CONTENTS

Chapter Contents Page

1. Safety instructions (important � read by all means for your own safety!) .......................................... 31.1. Additional important information ........................................................................................................... 3

2. Included in delivery ............................................................................................................................ 42.1. Visual version ....................................................................................................................................... 42.2. Photographic version ............................................................................................................................ 4

3. The optical train within the Herschel Prism � general description................................................... 43.1. The pre-mounted filters ........................................................................................................................ 5

4. Observation techniques .................................................................................................................... 64.1. Visual observation ................................................................................................................................ 74.2. Tips for visual observation .................................................................................................................... 74.3. Photographic observation ..................................................................................................................... 84.4. Tips for photographic observation ........................................................................................................ 94.5. The Herschel-Prism in combination with the Baader Astro T2 System ........................................... 10

5. The Herschel-Prism for experts....................................................................................................... 11

6. Techncal data of the Herschel-Prism .............................................................................................. 12

7. Weblinks............................................................................................................................................. 12



1. SAFETY INSTRUCTIONS

Solar observation in white light (the Solar photosphere � Sun spots, Solar

granulation and Solar faculae) is one of the most interesting activities in as-tronomy. However this kind of observation may be dangerous, if the deviceis being handled incorrectly. Improper use may cause damage to the eye �even complete blindness. For this reason please read these safety instruc-tions carefully.

The Baader Safety Herschel-Prism was designed specially for Solar obser-vation with refracting telescopes (also see below). Any commercial refractorwith an aperture ranging from 90 to 110mm (e.g. Celestron Omni-XLT se-ries refractors) will already show all visible Solar phenomena accessible tothe Astro amateur.

The Baader Safety Herschel-Prism is a professional accessory for the seri-ous amateur. Using it requires responsible handling.

Following precautions apply for visual observation:

- Do not use this product if you do not feel well informed about possiblehazards and the consequences of wrong handling. If you have questions, please contact us.

- Never remove the pre-mounted neutral-density filter (#2458332) 1:1000 (OD 3.0), except for eyepiece projectionphotography (see pages 5-6).

- Always mount the Baader Safety Herschel-Prism onto the focuser before aiming the telescope at the Sun.- If more than one telescope is attached to your mount, be sure that the lenses of all other optics � except for the

one utilizing the Baader Safety Herschel-Prism � are being carefully and securely covered to exclude any Solar

radiation entering unnoticed into any other telesope or finder scope pointing towards the Sun.- Never will you leave this instrument � or any telescope � unattended during the day-time respectively during

Solar observation, especially with inexperienced observers and/or CHILDREN.- Children especially must be prevented from using this instrument on their own, without expert supervision! This

device is not a toy. It is not intended to be used by children under 13 years of age.

The Baader Safety Herschel-Prism features a ceramic window which works as Solar finder screen and �heat cage�

at the same time. Due to the closed design of the magnesium prism body there is no dangerous amount of lightexiting the Baader Safety Herschel-Prism. Due to this improvement the Herschel-Prism evolves into a safe devicefor Solar observation � even and especially for educational purposes.

Following precautions apply for photographic observation:

- Never remove the pre-mounted neutral-density filter (#2458332) 1:1000 (OD 3.0) for prime focus imaging (seepage 8)

- When checking focus during focal- or eyepiece projection photography be sure, that the image of the sun is nottoo bright. In case the image appears too bright, use a neutral density filter (#2458245 1:64 OD=1.8) and hold itbetween your eye and the camera.

1.1. Additional important advice

1. Never mount any filter into the front 2� nosepiece of the Baader Safety Herschel-Prism. During Solar observa-tion the full energy of the Sun reaches the Herschel-Prism unabated. For this reason any additional filtering orreduction of light must never happen in front of the Herschel-Prism since the heat load would be so large thatany filter mounted in this place would be shattered immediately (in the focus of an unfiltered 6� refractor at f/10

to f/15 temperatures up to 600°C are being measured).

2. In case of using the photographic version of the Herschel-Prism for visual application the user must make ab-solutely sure that the neutral density filter OD 3.0 (#2458332) is mounted in the correct place directly above theHerschel-Prism in the beam of light that is exiting from the Herschel-Prism into the eyepiece. This ensures thatno harmful amount of energy can enter into the eye of the observer. However it will be necessary to further re-duce Solar light for reaching comfortable brightness. This is being achieved either by adding a Solar Continuum



filter, alternatively by using appropriate neutral density filters of the photographic version or by using a polarizingfilter as explained on page 7/8.

3. The Baader Safety Herschel-Prism is an accessory, which is to be used in combination with refracting tele-scopes only. Any other optical designs (like Newton, SC, MAK and so on) use optical or mechanical parts nearthe focal plane, which will be destroyed by the heat of solar radiation. If you want to utilize any reflective tele-scope for solar observation, shield the front aperture with our patented Baader AstroSolar safety film. You willfind all information on AstroSolar safety film on our website:http://www.baader-planetarium.de/sektion/s46/s46.htm

4. Never use welding glasses, emulsion film or similar auxilliary aids for filtering Solar light. All these means arenot designed to fully shield off dangerous radiation of the IR or UV part of the spectrum.

2. INCLUDED IN DELIVERY

The Baader Safety Herschel-Prism contains the following accessories:

2.1. Visual version (# 295 6500 V):

- Baader Safety Herschel-Prism with 2� nosepiece and 2� Baader ClickLock® eyepiece clamp

- #2458332 2� Neutral Density filter OD 3.0 (1:1000, transmission 0.01%)

- #2458391 2� Baader Solar Continuum filter

Both filters are pre-mounted above the Herschel-Prism itself (see page 5-6). If you wish to observe with 1¼� eye-pieces, use a reducer adapter 2� to 1¼� or remove the 2� ClickLock

® eyepiece clamp and exchange it against op-tional Astro T-2 system part #27 (#1508035 2�/T-2 thread adapter and 2� filter holder) and add one of several op-tional 1¼�/T-2 eyepice holders. For various 1¼�/T-2 eyepiece holders see our website:

http://www.baader-planetarium.de/sektion/s08/s08.htm

2.2. Photographic version (# 295 6500 P):

- Baader Safety Herschel-Prism with 2� nosepiece and 2� Baader ClickLock® eyepiece clamp

- #2458332 2� Neutral Density Filter OD 3.0 (1:1000, transmission 0.01%),

- #2458391 2� Baader Solar Continuum filter

- additional one of each 2� Neutral Density filters, OD 0.6 (#2458321), 0.9 (#2458322) and 1.8 (#2458331).

The Baader Solar Continuum- and the Neutral Density filter OD 3.0 are pre-mounted into the prism-body in the as-delivered-condition.

3. THE OPTICAL PATH WITHIN THE SAFETY HERSCHEL-PRISM

The graphic on page 5 shows the optical path within the Baader Safety Herschel-Prism. The Solar light enters intothe prism body from the right and falls onto the 45° inclined first prism surface. Approx 4.6% of Solar light are being

reflected into the eyepiece or camera respectively. The much larger percentage of light (95.4%) exits the rear faceof the prism and would form a focal point outside of the prism body.

Please note: Baader Planetarium GmbH cannot be held liable for consequences of wrong handling of the Baa-der Safety Herschel-Prism during Solar observation.

If you do not understand any part of this manual or if you have questions regarding the handling of the BaaderSafety Herschel-Prism, please contatct us: Tel.: 08145-8802, Email: [email protected].



mailto:[email protected]



The exiting beam in the Baader Safety Herschel-Prism is fed into a separate �heat cage� which is sealed with a

special heat-absorbing ceramic tile. Like on a space shuttle the ceramic tile traps the radiant energy without over-heating its surroundings. The body of the Baader Safety Herschel-Prism is closed on all sides which prevents anydanger of contacting direct Sunlight, making it safe for educational work. Since the �heat cage� is separated from

the prism body and only connected with four screws, there is virtually no heat distribution extended into the prismitself.

The translucent ceramic tile also acts as projection screenshowing an unfocused image of the Sun. Aiming the tele-scope at the Sun is now esier than ever before.

The 2� ClickLock® clamp securely clamps any 2� eyepiece

or 2�/1¼� reducer with only the small rotation of a lever.

Change eyepieces with only one hand even in winter withheavy gloves.

IMPORTANT ADVICE:

Due to production standards, the 2� nosepiece in front of

the Baader Safety Herschel-Prism features a 2� (M48) filter

thread. However - never attempt to mount any 2� filter in

front of the Herschel-Prism! Any filter mounted into the fullbeam of Solar energy so near to the focus will become ex-tremely hot and will be damaged within seconds (see safetyadvice, page 3). Each and every filter must be mountedabove the exiting side of the prism.

3.1. The pre-mounted filters in the prism body

Both versions of the Baader Safety Herschel-Prism (visual andphotographic) are equipped with two 2� filters mounted above

the exiting side of the Herschel-Prism. Mounted directly abovethe prism is a 2� Solar-Continuum filter (#2458391), with the

strongly reflecting surface facing the prism. Above that � i.e.

directly in front of the eyepiece or camera � a neutral density

filter OD 3.0 (1:1000) #2458332 serving as energy reducer.This orientation of filters ensures a Solar image free of un-wanted reflections.

The Illustration to the right exemplifies the filter arrangement.

For changing filters unthread the 2� Click Lock® clamp

from the prism body. Now seperate the connectingthreaded ring 2�/M48. This ring serves as connecting

element to attach the 2� Click Lock® clamp onto the

prism body and additionally as filter holder for one ortwo standard 2� filters.

The 2� Solar Continuum filter may be removed and ex-changed against another neutral density filter. As de-tailed earlier (page 3), the OD 3.0 filter #2458332 mustonly be removed during photographic observation andexchanged against one of the other neutral density fil-ters supplied with the photographic version of theBaader Safety Herschel-Prism to achieve shortest pos-sible exposure times.

Direction pointingtowards the Her-schel Prism

Solar Continuum filter

Neutral density filterOD 3.0

2� threaded ring with

M48 filter thread

To the eyepiece

Solar Continuum filter

Neutral density filterOD 3.0

2� threaded

ring 2� / M48 2� ClickLock

eyepiece clamp

4.6% reflected lighttowards the eyepiece

Enteringbeam of

light

Ceramic tile (Solarfinder screen)

95.4% of lightexiting unused



The Solar Continuum filter is a true narrowband filter featuring10nm half-bandwidth (HBW) at the passband of 540nm at thesame time supplying maximum spectral transmission. This hasfollowing advantages for Solar observation:

Most achromatic doublet objectives used in Astronomy are notcorrected equally well across the full visual spectrum (actuallythey have a noticeable color error). For such lenses the SolarContinuum filter isolates the very spectral range where these ob-jectives are well corrected. This will yield best possible contrastand sharpness for economy refractors and enable much highermagnifications.

Additionally Solar granulation is most contrasty in that very spec-tral range around 540nm.

At the same time, the Baader Solar Continuum filter greatly improvesseeing conditions by suppling a steadier Solar image because the shortportion of the Solar spectrum below 535nm is being blocked (thermallyinduced seeing effects become less prominent with longer wavelengths oflight).

When using apochromatic (fully color corrected) APO-refractors (e.g. As-tro Physics, TEC, Zeiss) the Solar Continuum filter may be removed, inorder to observe the Sun in integral white light with the same contrast asis only achievable using the Solar Continuum filter when observing withordinary achromates.

4. OBSERVATION TECHNIQUES

In case you acquired a Baader Safety Herschel-Prism around 2010 it will enable you to observe a complete Solarcycle streching approximately across the next 11 years. At the moment, the Sun appears virtually �blank�. However

the amount of Sun spots should greatly increase within the year 2010 to reach a climax during maximum activity,approximately 2015/2016.

Tips and Tricks:

Especially when observing the Sun, seeing plays an important role because the atmosphere heats up much moreduring the day especially in summer.

Depending on the location there is a specific daily cycle of seeing conditions normally from better to worse andback. According to experience, there are two preferable observation windows during the day � namely in the early

morning before the atmosphere gets heated up and late in the afternoon (before sunset) while the atmosphere isslowly and continuously cooling down.

Important also is the type of landscape overlooked with the telescope. When looking over territory abundantly cov-ered with vegetation (parks, forrests) or large lakes or sea, seeing conditions will be much improved compared tolooking over �chaotic� terrain like city-rooftops. For regular repeated Solar observation it is important to register the

�seeing cycle� for the chosen location.

Two additional considerations in order to improve seeing conditions � i.e. image quality:

- Using the Solar Continuum filter as detailed above- Every time when not observing, the optical axis of the telescope should not be facing the Sun, in order to en-

able the air trapped within the telescope as well as the Herschel-Prism to cool down.



4.1. Visual observation

- Limb darkening

Limb darkening of the Sun is a constant Solar phenomenon and immediatelyvisible when aiming the telescope at the Sun. Limb darkening is caused bythe fact that the Sun consists of hot gas whose temperature is reducing to-wards the surface. Looking at the middle of the Sun means to look onto thehottest and deepest region. Looking at the edge however shows less denseand consequently less bright regions. Were the Sun a solid body, no limbdarkening could be observed.

- Sun spots

Sun spots consist of a core region (Umbra) and a brighter surrounding region(Penumbra). Sun spots are cooler (approx. 8000°C) than the undisturbed

Solar face. At this locations magnetic storms are bursting through the granu-lated photosphere.

All Sun spots go through a detailed cycle � normally from a small single spot

evolving into a complex group of spots developing distinct magnetic north andsouth poles. Changes in these complex groups are the fastest movingchanges observable in the Solar system. Complex changes may take justminutes, making the Solar observation in white light so very interesting.

Additional phenomena:

- Light bridges- Umbral dots- Penumbral filaments- Schuelen � Wilson phenomenon

- Photospheric faculae

Faculae are being recognised as bright areas within the Solar surface andusually are grouped around Sun spots. These faculae regions are hotter thanthe rest of the Solar photosphere. During observation in integral light with aHerschel-Prism such bright regions are mainly visible near the limb of theSun, since the area appears darker than the central regions (see page 11)

4.2. Tips for visual observation:

- Check for correct filtering:

If the Solar image appears too bright, f.e. when using a short focal refractor,when using very low magnification or after having removed the Solar Contin-uum filter (so that only the OD 3.0 filter remains in the beam of light) it ismandatory to add an additional neutral density filter instead of the Solar Con-tinuum filter. We offer three additional neutral density filters, OD 0.6 / 0.9 / 1.8� each being available in 2� or 1¼� size in order to reach a convenient bright-ness of the Solar image. See filter selection on our website:http://www.baader-planetarium.de/sektion/s39/s39.htm #2408342

2� Single Polarizing filter




- Continuous variation of brightness using Baader Polarising filters

The light reflected from the Herschel-Prism surface is already partly polarized.For this reason a single polarizing filter can be mounted directly onto the 1¼�

or 2� nosepiece of any eyepiece allowing to vary the image brightness just by

rotating the eyepiece.

This allows an exceedingly easy way to adjust brightness for any observingconditions, be it summer or winter, clear or partially overcast sky, focal ratio oftelescope and eyepiece magnification. 2� and 1¼� Single Polarizing filters can

be found on our website:http://www.baader-planetarium.de/sektion/s38/s38.htm

- Binocular Solar observation

The Baader Safety Herschel-Prism in principal enables binocular vision. The �stereo� vision of the Sun � for in-stance using our Maxbright Binocular viewer is a very special experience as the Sun appears stereoscopic. Wewill gladly guide you to find out if and how you can use a binocular viewer in combination with your telescopeand the Baader Safety Herschel-Prism.

4.3. Photographic observation

Solar photography is divided into prime focus imaging and Solar projectionphotography. In any case the sensor in use today is the CCD chip, chemicalemulsion photography has virtually disappeared. Phenomena observed arethe same as detailed in chapter 4.1.

- Prime focus imaging (= direct connection of CCD or DSLR-camera

body without camera lens)

Prime focus imaging is being applied, when the complete Sun is to beimaged. As shown in the image to the right the camera body is beingconnected onto the Baader Safety Herschel-Prism using a standard 2�/T-

2 nosepiece and T-mount ring.

Rule of thumb for calclating the size of the Solar image on the chip plane:

1. APS camera chips: 1000mm focal length of the telescope will provide approx. 10mm diameter of Solar im-age on the chip.

2. For smaller chip formats the appropriate reduction factor has to be applied, normally 0.5x.

Initially leave the OD 3.0 neutral density filter as well as Solar Continuum filter mounted inside the Prism body.Attach the camera and choose b/w mode. Exposure times (at moderate ASA/ISO settings of /125) should bearound 1/1000 sec. This ensures that seeing (air movement) will be almost�frozen�. If 1/1000 sec exposure times are not achieved, exchange the OD

3.0 filter against a filter with OD 1.8 (#2458331) in order to shorten expo-sure time.

- Afocal photography (= using a fixed-lens digital camera)

Afocal photography mostly is applied, if no DSLR camera is available andthe camera used is equipped with a non-removable zoom-lens. Afocalphotography is a special version of projection photography. It can be ap-plied for imaging the complete Solar disc as well as for enlarged views ofSolar regions. The changing of so-called equivalent focal length is beingeffected by varying the zoom factor of the digital camera lens.

#24083431¼� Single Polarizing filter




Information concerning necessary accessories for afocal photography can be found on our website:http://www.baader-planetarium.de/sektion/s15/s15.htm

For more information concerning the techniques of afocal photography, please visit:http://www.baader-planetarium.de/sektion/s15/kundenreferenz/afokales_projektiv/infoseite-projektiv.htm

- Projection photography

This method for Solar photography is used for detailed imaging of Solargranules or individual Sun spots. In this case the focal image of the Sunis being projected onto the imaging chip similar to projection techniquesused in a slide projector or beamer, see also:http://www.baader-planetarium.de/sektion/s16/s16.htm

In this case a projection system is being required which causes expo-sure times to increase exponentially. For this kind of Solar photography,webcams and video cameras are preferable which allow a stream ofimages to be stacked. Also see:http://www.baader-planetarium.de/dmk/dmk_start.htm

Suitable projection lenses are:

Eyepieces with low distortion (preferable Ortho eyepieces) Eyepiece holding systems such as Baader OPFA systems Alternatively Baader FFC � Fluorid Flatfield Converter, see also


Whereas the Baader FFC will provide the highest known contrast and sharpness of any projection eyepiece orbarlow lens, owing to its two fluorite doublet lens groups.

For initial test images using DSLR cameras, a simple barlow lens or existing photographic teleconverter may beused, which roughly doubles the telescope focal length.

Important advice:

For each and every type of projection photography � be it by barlow lens, eyepiece projection, teleconverter pro-jection or with FFC � the projection device must be mounted above the Herschel Prism. It is not possible to use any

cemented lenses in front of the Herschel Prism as they will be damaged beyond repair within seconds.

4.4. Tips for photographic observation

Photography in prime focus mode requires very short exposuretimes which keep seeing effects quite low. However when usingprojection photography exposure times significantly increasetogether with the equivalent focal length. This greatly increasesthe influence of seeing effects such as air turbulence.

As mentioned before seeing effects are depending on wavelength, stronger in the blue wing of the spectrum and lessprominent in the longer wave length in the red end of the spec-trum. For this reason it can be beneficial to only image in the redspectral range. Many successful Solar imagers are using aBaader IR-Passfilter (#2458386) in order to minimize seeingeffects � the same technique is being applied for planetary im-aging. When using an IR-Passfilter, the Solar Continuum filtermust be removed from the path of light. Also see:http://www.baader-planetarium.de/sektion/s34a/s34a.htm


http://www.baader-planetarium.de/sektion/s15/kundenreferenz/afokales_projektiv/infoseite-projektiv.htm


http://www.baader-planetarium.de/dmk/dmk_start.htm


http://www.baader-planetarium.de/sektion/s34a/s34a.htm



4.5. The Herschel-Prism in combination with the Baader Astro T-2 system

Shows combinations of the Baader Safety Herschel-Prism with the Astro T-2 system. This diagram may bedownloaded in high resolution from: http://www.baader-planetarium.de/sektion/s37/download/herschel_t2_e.pdf

http://www.baader-planetarium.de/sektion/s37/download/herschel_t2_e.pdf



5. THE HERSCHEL-PRISM FOR EXPERTS

Solar photography in the blue spectral region

In the dark blue spectral range around 400nm photosphericfaculae show up prominently in the vicinity of Sun spotseverywhere on the Solar surface. When observing in inte-gral light, these faculae regions are visibile only at the limbof the Sun. For observing in the spectral passband of395nm the 1¼� Baader K-Line filter (#2458355) can be

applied.

The two emission lines of Ca II, the single ionized Calciumat 397nm (H-line) and 393nm (K-line) are prominent in thatwavelength. The half bandwidth (HBW) of the Baader K-Line filter measures 8nm.

Tips and Tricks:

The human eye is very insensitive (almost blind) in the spectral regionbelow 420nm, therefore visual observation is not possible respectively notpleasing. The only appropriate sensors will be DSLR cameras, but evenmore successful will be webcams.

It is a miracle to us, why competitors offer �CaK�-telescopes for visual ob-servation in that passband of the spectrum, while every sun-tan-studio isrequired by EU-law to warn customers not to look straigt into UV-A-radiation. Observing below 400nm is nothing else than looking into UV-A.

In order to make use of the high quality of the Baader K-Line filter in com-bination with a Herschel-Prism, the astronomical lens used for this pur-pose should be of apochromatic quality grade or be specially designed todeliver a color corrected image at 400nm. Most simple achromatic dou-blets are very badly color corrected so far in the blue wing of the spectrumso that images made with such optics will not supply pleasing results.

Now we would like to wish you all success and much pleasure observing our star, using

the Baader Safety Herschel-Prism.

Your BAADER Team

Image data: Herschel-Prism and BaaderK-Line filter, ©Mario Weigand. For more

images see Homepage of Mr Weigand:http://www.skytrip.de/son.htm

http://www.skytrip.de/son.htm



6. TECHNICAL DATA

Adaptation options facing the telescope (included in delivery as standard):- 2" (50.8 mm) nosepiece with safety notch (do not use M48 filter threads!)- 2" (50.8 mm) female thread at the front end of the prism body- circular dove tail (circular groove) S58 x 3.7mm at the front end of the prism body- Female thread within the prism body itself, measuring M55 x 1mm

- Optional telescope adapters are available for Carl Zeiss M 68 and various other threadstandards

Adaptation options facing the eyepiece side:

- 2" (50.8 mm) ClickLock® clamp with brass-clamp-ring (included in delivery)

- Optional: 2�/T-2 adapter #27. Converts from 2� female thread in the prism body into

photographic T-2 male thread for attaching camera t-mounts directly atop the prismbody without using the 2" ClickLock® clamp

Optical length: 114mm in the as delivered condition

Weight: 530 gram

Prism Body: Dye-cast magnesium, machined; flat black anodized; pearl white painted

Should you be interested in further kinds of Solar observation after experiencing the virtues of the Baader SafetyHerschel-Prism we recommend to evaluate using ultra-narrowband H-alpha filters made by SolarSpectrum. Pleasealso see:http://www.baader-planetarium.de/solarspectrum/sol_spec_start.htm

A detailed introduction into the history of Solar observation and various observation techniques is available at:http://www.baader-planetarium.de/solarspectrum/funktion_halpha/index_halpha.htm

7. WEBLINKS

Please check our news site from time to time for updates on Solar observation:http://www.baader-planetarium.de/news/baader_news.htm

Sun and Solar observation in general:http://www.baader-planetarium.de/zubehoer/zubsonne/sonne/index-sonne.htm

Current images of the Sun in integral light:http://spaceweather.com

Current images of the Sun in different spectral regions taken by SOHO-spaceprobe:http://sohowww.nascom.nasa.gov/data/realtime-images.html

Version of this manual: June 2010. We reserve the rights for changes of the manual if required.Current version can be downloaded from:http://www.baader-planetarium.de/sektion/s37/s37.htm

Copyright 2010 by BAADER Planetarium GmbH, Mammendorf. Any kind of reproduction, copying or distribution of this document for commer-cial purposes be it partial or in full regardless of the medium is herewith expressively disagreed with. Publication and copying of this documentdoes require written authorization of Baader Planetarium GmbH.

We reserve the right for errors, technical changes, availability and changes of basic outfit.

G:\Anl\Baa\Zub\Sonne\Herschel

http://www.baader-planetarium.de/solarspectrum/sol_spec_start.htm

http://www.baader-planetarium.de/solarspectrum/funktion_halpha/index_halpha.htm

http://www.baader-planetarium.de/news/baader_news.htm

http://www.baader-planetarium.de/zubehoer/zubsonne/sonne/index-sonne.htm

http://spaceweather.com

http://sohowww.nascom.nasa.gov/data/realtime-images.html


Documents

Baader Cool Ceramic (Safety)- Herschel Œ Solar Prism€¦ · The Baader Safety Herschel-Prism features a ceramic window which works as Solar finder screen and ﬁheat cageﬁ at